[meta-virtualization] [PATCH V4 3/3] README: update to include information about bbappend inclusion

[Chen Qi]

Update README file to include information about bbappend file inclusion,
telling the users that 'virtualization' needs to be in DISTRO_FEATURES
to make some bbappend files to be effective.

Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
---
 README | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README b/README
index 2578f90..49fda10 100644
--- a/README
+++ b/README
@@ -4,6 +4,11 @@ meta-virtualization
 This layer provides support for building Xen, KVM, Libvirt, and associated
 packages necessary for constructing OE-based virtualized solutions.
 
+The bbappend files for some recipe (e.g. linux-yocto) in this layer need to
+have 'virtualization' in DISTRO_FEATURES to have effect. To enable them, add
+in configuration file the following line.
+DISTRO_FEATURES_append = " virtualization"
+
 Dependencies
 ------------
 This layer depends on:
-- 
2.11.0